Corp. Code, § 12353

(a) A corporation shall have (1) a chair of the board, who may be given the title chair, chairperson, chair of the board, or chairperson of the board, or a president or both, (2) a secretary, (3) a treasurer or a chief financial officer or both, and (4) any other officers with any titles and duties as shall be stated in the bylaws or determined by the board and as may be necessary to enable it to sign instruments. The president, or if there is no president the chair of the board, is the chief executive officer of the corporation, unless otherwise provided in the articles or bylaws. Unless otherwise specified in the articles or the bylaws, if there is no chief financial officer, the treasurer is the chief financial officer of the corporation. Any number of offices may be held by the same person unless the articles or bylaws provide otherwise. Either the chair of the board or the president shall be elected from among those board members elected by the membership of the corporation.

(b) Except as otherwise provided by the articles or bylaws, officers shall be chosen by the board and serve at the pleasure of the board, subject to the rights, if any, of an officer under any contract of employment. Any officer may resign at any time upon written notice to the corporation without prejudice to the rights, if any, of the corporation under any contract to which the officer is a party.